Echinodermcila. 
81 
gl ' ou P ed in tllis division are very different in 
a more nr l’ 7 , m hav, "S r thcir soft parts enclosed within 
pktes dri f 1,d ealcareOU ? COTe ™£, composed of numerous 
plates, disposed usuaUy m a distinctly radial arrangement. 
o ' . . 1S “''J 1 Structure is particularly observable in the 
variX nfT (EcUnmd i a - ■>’ ? hose teste, °f marvellous beauty and 
spines 1 T 1 ' aie ’ A™ hvm =’ covered with rows of moveable 
sucl ers in l h Serv !- as def ™ ces - andaid the ambulacral tubes or 
77 , T^Ti The *P ine *’ whioh a ™ calcareous, vary 
A™ len f l and form > being often very minute, but some 
times of great thickness, or of extraordinary length Manv 
examples of these are exhibited. Some of the latest of the 
Mol-att eA ’ nrc lln ®, palled Clypeaster , are from the quarries of 
Xokattam, near Cairo, whence the Nummulitic Stone used in 
Tim V P "V “ e ? yramid8 ’ was q aai 'ried (Wall-case No. 15). 
Table-cases°Nos. 1 7 T ^ 0Wk and °° Ute are P laced in 
nnd“p-»t th ° St f r ' fis b. es the magnificent series of Pentaqonaster 
the r™7V mm i u Chalk , ; the fine 8olaster M oretoni s , from 
e Gi eat Oohte, With thirty-three arms; and the five-raved 
S tell aster Sharpu from the Northampton Ironstone, deseWe 
special notice. (Table-case No. 76.) 
n/l Th V; Bn 7 ta '” such as Ophioderma Eqertoni, from 
the Lias of Lyme Regis, and others of Silurian age, resemble 
lose now found living on our own coasts. (Table-case No 75 ) 
4. the Stone-Lilies (Crixoidea), so rare in our modern seas 
periods 1106 abundant in the Secondary and Paleozoic 
„ They were fixed during life to the sea-bottom by means of a 
flexible stalk The body was of variable shape, but covered bv 
calcareous plates, and surmounted by branched arms from five 
to ten m number. 
The most striking objects of this group are the Lily-encri- 
nites (Encrmus hUiformis), from the Musehelkalk of Bruns- 
wick (Wall-case No. 17); the Pear-enerinite (Apiocrinus 
7 m , the t .?? df01 ’ d Clay - of Wiltshire (Table-case 
t,°i'i ' the he arrtiful E.rtracnnus Hiemeri, from the Lias of 
ImiIJ, YVurtemberg, and the Extracrinus fossilis from Lyme 
Kegis, Dorset (Wall-case No. 16 and Table-case No. 74). 
Placed on the wall, near the case of Lias Pentacrinites is a 
fine polished slab of “ Entrochal or Encrinital marble ” from 
Derbyshire, almost entirely composed of the broken stems of 
Achnocnnt (Stone-lilies), from the Carboniferous limestone 
1 he cases containing the older forms, from the Wenlock lime 
stone (U. Silurian), near Dudley, are deserving of special 
notice ; also the fine series of North American Carboniferous 
and Silurian genera (Wall-cases Nos. 17 and 18). 
The curious and anomalous forms of Cystoidea and Blashidea 
(1189) 
Gallery, 
No. 8 
on Plan, 
East side. 
Echinoidea, 
Sea- 
Urchins. 
Wall-case, 
No. 15. 
Table-cases, 
Nos. 76 to 
78. 
Star-fishes. 
Table-case, 
No. 76. 
Brittle- 
stars. 
Stone-lilies. 
Wall-case, 
No. 17. 
^able-case, 
No. 75. 
Wall-case, 
No. 16, and 
Table-case, 
No. 74, 
Wall-cases, 
Nos. 17 and 
18. 
